Wound bobbin



Nov. 15, 1927.

R. v. SNYDER WOUND BOBBIN Filed Feb. 5.

m/ l u E l/m QAM l/M I; 2 mY/2 5 iqi/ R o T N E V m ATTORNEYS Patented Nov. 15, 1927.

UNITED 'STATES PATENTy OFFICE.

REX. V. SNYDER, F EAST ORANGE, JERSEY, ASSIGNOR T0 'JI-HE AMERICAN THREAD COMPANY, 0F `NEW' YORK, N.

WOUND Y., A CORPORATION OE NEW JERSEY.

:Bomann application inea rebr'uarys, 192s. serial No. $5,647.

I My invention relates to new and improved bobbins for sewing machines and the hke and has for its object to provide a wound bobbin having a tubular core and end pieces o secured-thereto by overlapping portions of the core secured by adhesive.

The following is a description of an embodiment of my invention, reference being had to the accompanying drawings, 1n which, A

Figure 1 showstheelements of the bobbin assembled and in position to be compressed;

Fig. 2 shows a central section of the bob# bin in completed form;

Fig. 3 shows an end view of the-same.

Referring more particularly to the-drawings, Fig. 1, 2 is a core upon whichjis a mass of thread 4 universally wound. 6' are i end pieces of cardboard or other suitable adapted to fit over theends of the core. These end pieces have c oncavo-convexportions n8, and a flattened zone surrounding the perforations, the inner concave surface of the disk conforming approximately to the normal curvature of the thread mass when first wound. The ends of the tubular core are slitted as shown at 12 and in the complete d bobbin the resulting projections 14 are bent over the flattened zone and secured thereto by adhesive.r Thisbending is done by suitable plungers which not only bent over the .projections 14 so .-as to form the core 2 of Fig. 2 lbut compress the mass of thread as shown at 4, Fig. 2, so as to make its ends conform closely to the 4inner surfaces of the end pieces, as shown in Fig. 2. The normal curvature of the concave-convex portions of the disk is slightly sharper than the normal -curvature of the end pieces of the uncompressed wound mass with the result that thepieces are under a spring tension and exert a pressureupon the mass which material .having'perforations at their center' tends to hold the end pieces in contact with the outer edges of the mass so as to prevent a formation of 'spaces into which a thread being unwound is liable to fall.

The concavo-convex portions of the disk result in forming a re-entrant portion 16 in which the bent over portions 14 are con- 50 tained so as to be removed from contact with the walls of the bobbin holder, so that the friction is substantially on the higher external surfaces of the concavo-convex portions of the disks.A

YIn this way a bobbin is produced in which --the end pieces are'securely held by adhesive in conjunction with the bent -over portions of the core.-

As will'be evident to those skilled in the -art, my invention permits various modifications without departing from the spirit j thereof or the scope of the appended claims.

What I claim is: 1. A wound bobbin comprisinga core, a massv of thread wound universally thereon, perforated end pieces surroundingsaid core and adjacent to the ends of said mass, the ends of the core being slit and bent over the outer surfaces of said end pieces, said end pieces having central reentrant portions containing the bentover slit ends of the core.

' 2. A wound bobbncomprising a core, a mass of thread wound universally thereon, perforated end pieces surrounding said core and adjacent to the ends of said mass, the ends ofthe core being slit and vbent over the -outer surfaces of said end pieces, and secured thereto by adhesive, said end pieces having central reentrant portions containing the bentV over slit ends of the core.

In testimony whereof, I have signed myl name to this specification this first day of February, 1926. I i

REX v. SNYDEB; 

